TWI721277B - Display device - Google Patents

Abstract

The present disclosure provides a display device including: a first substrate and a plurality of first electrodes. The plurality of first electrodes are formed on a same surface of the first substrate and are spaced apart from each other, and are used as common electrodes for display. The plurality of first electrodes includes at least one first sub-electrode and a plurality of second sub-electrodes, the area of each first sub-electrode is smaller than the area of any one of the second sub-electrodes. When the display device is displaying, a first common electrode voltage is applied to the first sub-electrode, and a plurality of second common electrode voltages different from the first common electrode voltage are applied to the second sub-electrodes, respectively. The display device of the present disclosure adjusts the common electrode voltage by the size of the first electrodes ， thereby adjusting the brightness of the display screen.

Description

Display device

The invention relates to a display device, in particular to a display device with touch function.

With the continuous development of science and technology, display devices with touch functions have been used more and more widely in various applications. Depending on the principle of different sensing technologies, there are resistive, capacitive, optical and other technologies. Application and development. In-cell touch display technology is an in-cell touch panel technology that integrates touch sensors in a TFT-LCD (thin film transistor-liquid crystal display) display panel.

In the in-cell touch display device, in order to be thin and light, the plurality of common electrodes of the in-cell touch display device are used as one of the touch driving electrodes or the touch sensing electrodes. The sensing electrodes cooperate to sense the touch operation and identify the position coordinates of the touch operation. At present, other designs of touch display panels (such as digging holes) may change the area of at least part of the common electrodes, resulting in inconsistent load of each common electrode and uneven brightness of the display screen, which affects the display effect and reduces the use The comfort of the user.

In view of this, it is necessary to provide a display device with better performance.

A display device, comprising: a first substrate; a plurality of first electrodes, the plurality of first electrodes are formed on the same surface of the first substrate and are arranged at intervals, and the plurality of first electrodes serve as Is a common electrode used for display of the display device; the plurality of first electrodes include at least one first sub-electrode and a plurality of second sub-electrodes, and the area of each first sub-electrode is smaller than the area of any one of the second sub-electrodes; When the display device performs display, a first common electrode voltage is applied to the first sub-electrode, and a second common electrode voltage different from the first common electrode voltage is applied to the second sub-electrode.

Compared with the prior art, the display device of the present invention can adjust the display image by adjusting the voltage of the common electrode output from the driving circuit to the first electrode according to the difference between the electrode area of the first sub-electrode and the second sub-electrode. The brightness of the display screen avoids uneven brightness.

100: display device

1: the first substrate

2: second substrate

3: Liquid crystal layer

4: The first electrode layer

40: first electrode

41: The first sub-electrode

42: second sub-electrode

5: The second electrode layer

50: second electrode

6: Drive circuit

7: The first line

FIG. 1 is a schematic plan view of a display device according to a preferred embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view taken along the line II-II of Fig. 1.

FIG. 3 is a schematic diagram of a plan layout of a first electrode according to a preferred embodiment of the present invention.

The accompanying drawings show embodiments of the present invention. The present invention can be implemented in a variety of different forms, and should not be interpreted as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more comprehensive and complete, and to enable those skilled in the art to fully understand the scope of the present invention.

It can be understood that although terms such as first and second may be used herein to describe various elements, regions, layers and/or parts, these elements, regions, layers and/or parts should not be limited to these terms. These terms are only used to distinguish elements, regions, layers and/or parts from other elements, regions, layers and/or parts. Therefore, as long as it does not depart from the teachings of the present invention, the first element, region, layer and/or section discussed below may be referred to as a second element, region, layer and/or section.

The embodiments of the present invention are described here with reference to cross-sectional views, which are schematic diagrams of idealized embodiments (and intermediate structures) of the present invention. Therefore, the difference in the illustrated shape due to the manufacturing process and/or tolerances is foreseeable. Therefore, the embodiments of the present invention should not be construed as being limited to the specific shape of the area illustrated here, but should include, for example, the deviation of the shape due to manufacturing. The areas shown in the figures are only schematic, and their shapes are not used to illustrate the actual shape of the device, and are not used to limit the scope of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as commonly understood by those of ordinary skill in the art described in the present invention. It should also be understood that terms such as those defined in general dictionaries should be interpreted as having meanings that are consistent with their meanings in the context of the relevant field, and should not be interpreted as excessively idealized or excessively formal meanings. , Unless explicitly defined in this article.

In this embodiment, a liquid crystal display device with integrated touch sensing function is taken as an example for description. However, it is not limited to liquid crystal display devices. In other embodiments, the touch sensor of the present invention may be suitable for the technical solution. Other types of display devices. Specifically, the following will take a liquid crystal display device integrated with a touch sensing function as an example to describe specific embodiments of the touch display device of the present invention.

Please refer to FIG. 1, which is a schematic diagram of a three-dimensional structure of a display device 100 according to a preferred embodiment of the present invention. For the convenience of description, FIG. 1 only shows part of the elements of the display device 100, and other elements such as the cover plate, the backlight module, and the optical film set are omitted. The display device 100 includes a first substrate 1 and a second substrate 2 disposed opposite to the first substrate 1. A liquid crystal layer 3 is arranged between the first substrate 1 and the second substrate 2. A first electrode layer 4 is provided on the side of the first substrate 1 close to the liquid crystal layer 3. In other embodiments, the first electrode layer 4 may be disposed on the side of the first substrate 1 away from the liquid crystal layer 3.

Please refer to FIGS. 1, 2 and 3 together. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a schematic plan view of a first electrode in a preferred embodiment of the present invention. The first electrode layer 4 includes a plurality of first electrodes 40 that are independent of each other (set apart from each other). In this embodiment, the plural One electrode 40 is arranged in a matrix. In other embodiments, the first electrode 40 may be a strip electrode, a diamond electrode, or the like. As shown in FIG. 3, the display device 100 further includes a driving circuit 6, and each first electrode 40 is connected to the driving circuit 6 through a first wiring 7.

As shown in FIG. 2, in this embodiment, the first substrate 1 is a TFT (Thin Film Transistor) array substrate, which includes a plurality of TFTs (not shown), and the second substrate 2 is a color filter substrate (also called Opposite substrate). The plurality of first electrodes 40 serve as a common electrode of the display device 100. When the plurality of first electrodes 40 are used as common electrodes, the driving circuit 6 outputs a common electrode voltage (Vcom) to the plurality of first electrodes 40. The plurality of first electrodes 40 cooperate with the pixel electrodes (not shown) of the display device 100 to display image information. Specifically, the plurality of first electrodes 40 and the plurality of pixel electrodes generate an electric field, so that the liquid crystal molecules (not shown) of the liquid crystal layer 3 are deflected by a corresponding angle, thereby displaying an image.

As shown in FIG. 3, the plurality of first electrodes 40 includes at least one first sub-electrode 41 and a plurality of second sub-electrodes 41, and the area of each first sub-electrode 41 is different from the area of any one of the second sub-electrodes 42. In this embodiment, the area of each first sub-electrode 41 is different from the area of any one of the second sub-electrodes 42 due to the digging design of the first electrode layer 4. In other embodiments, the area of the first sub-electrode 41 and the second sub-electrode 42 may be different due to other design requirements. In this embodiment, three first sub-electrodes 41 are exemplarily shown, and the area of each first sub-electrode 41 is different. In other embodiments, at least two first sub-electrodes 41 have the same area. In an embodiment, the area of each first sub-electrode 41 may be the same. In this embodiment, the area of each second sub-electrode 42 is the same.

In this embodiment, since the areas of the first sub-electrode 41 and the second sub-electrode 42 are different, when the display device performs display, in order to avoid the difference in the load of the first sub-electrode 41 and the second sub-electrode 42 resulting in the brightness of the display screen The unevenness can be based on the difference between the electrode areas of the first sub-electrode 41 and the second sub-electrode 42 by adjusting the magnitude of the common electrode voltage output from the driving circuit 6 to the first electrode 40 to adjust the brightness of the display screen.

In this embodiment, the relationship between the electrode area in the first electrode 40 and the voltage compensation value can be obtained by a simulation test method. Specifically, it may be as follows: First, the common electrode voltage value required when the second sub-electrode 42 reaches a specified brightness is defined as a standard voltage value. Compare the common electrode voltage values required for the plurality of first sub-electrodes 41 to reach the specified brightness with standard voltage values to obtain the voltage compensation value required for each of the first sub-electrodes 41 to reach the specified brightness, Thus, the relationship between the electrode area in the first electrode 40 and the voltage compensation value is obtained. Further, according to the relationship between the electrode area in the first electrode 40 and the voltage compensation value, the driving circuit 6 outputs the common electrode voltage of the standard voltage plus the compensation voltage to the corresponding first electrode 40 to adjust the display image The brightness.

In this embodiment, the common electrode voltage output by the driving circuit 6 includes a first common electrode voltage and a second common electrode voltage, and the driving circuit 6 outputs the first common electrode voltage to the first sub-electrode 41. The driving circuit 6 outputs the second common electrode voltage to the second sub-electrode 42, and the first common electrode voltage and the second common electrode voltage are different. In this embodiment, the second common electrode voltage is a standard voltage, and the first common electrode voltage is a standard voltage plus a compensation voltage. In this embodiment, since the area of each first sub-electrode 41 is different, the voltage of each first common electrode is also different. It can be understood that in other embodiments, the areas of the plurality of first sub-electrodes 41 may also be the same, and therefore, the first common electrode voltage output to the plurality of first sub-electrodes 41 may also be the same.

In one embodiment, the voltage inside the driving circuit 6 can be adjusted to achieve the difference between the voltage of the first common electrode and the voltage of the second common electrode.

In an embodiment, the voltage of the first common electrode and the voltage of the second common electrode can be different by adjusting the internal current of the driving circuit 6.

In an embodiment, the internal resistance of the driving circuit 6 can be adjusted to achieve the difference between the voltage of the first common electrode and the voltage of the second common electrode.

In an embodiment, the internal capacitance of the driving circuit 6 can be adjusted to achieve the difference between the voltage of the first common electrode and the voltage of the second common electrode.

It can be understood that the internal voltage/current/resistance/capacitance of the driving circuit 6 can be increased or decreased according to the area of the first sub-electrode 41 to adjust the common electrode voltage output by the driving circuit 6.

In this embodiment, the driving circuit 6 includes a plurality of pins (not shown), the driving circuit 6 includes a pin corresponding to each first electrode 40, and each first electrode 40 is guided by a corresponding lead. The pin receives its corresponding common electrode voltage.

As shown in FIG. 1 and FIG. 2, the display device 100 has a touch sensing function, and the display device 100 can be used for displaying images and sensing touch operation. In this embodiment, a second electrode layer 5 is provided on the side of the second substrate 2 close to the liquid crystal layer 3, and the second electrode layer 5 includes a plurality of second electrodes 50 that are independent of each other (arranged at intervals), The plurality of second electrodes 50 are arranged in a matrix, and each second electrode 50 is connected to the driving circuit 6 through a second wiring (not shown). It is understandable that in other embodiments, the second electrode layer 5 may be disposed on the side of the second substrate 2 away from the liquid crystal layer 3.

In this embodiment, the plurality of first electrodes 40 are also multiplexed as touch sensing electrodes of the display device 100, the plurality of second electrodes 50 are used as touch driving electrodes, and the second electrodes 50 are loaded into touch sensing electrodes. The driving voltage is controlled, and the plurality of first electrodes 40 output a touch induced voltage. Specifically, when a finger or a conductive body touches the touch screen of the display device 100, the capacitance between the first electrode 40 and the second electrode 50 is changed, and the display device 100 can calculate according to the change in capacitance Draw out the touch position of the finger or conductor.

In one embodiment, the plurality of first electrodes 40 are multiplexed as common electrodes and touch driving electrodes of the display device 100. In this case, the second electrodes 50 are used as touch sensing electrodes.

In an embodiment, a part of the plurality of first electrodes 40 is multiplexed as the common electrode and touch driving electrode of the display device 100, and another part of the plurality of first electrodes 40 is multiplexed as the common electrode of the display device 100. Electrodes and touch sensing electrodes. In this case, the second electrode 50 may not be provided.

In an embodiment, the first electrode 40 is multiplexed as a touch driving electrode; the driving circuit 6 time-sharing controls the first electrode 40 to be in the display phase and the touch phase; in the display phase, the driving circuit 6 outputs The first common electrode voltage is applied to the first sub-electrode 41, and the driving circuit 6 outputs the second common electrode voltage to the second sub-electrode 42. In the touch phase, the driving circuit 6 provides a touch driving voltage for the first electrode 41. It is understandable that because the areas of the first sub-electrode 41 and the second sub-electrode 42 are inconsistent, in order to avoid the inconsistent touch sensitivity of the touch display device due to the different loads of the first sub-electrode 41 and the second sub-electrode 42, The driving circuit 6 adjusts the touch driving voltage output to the first electrode 40.

When the first electrode 40 is multiplexed as a touch drive electrode, the touch drive voltage output by the drive circuit 6 includes a first touch drive voltage and a second touch drive voltage, and the drive circuit 6 outputs the first touch drive voltage. The driving voltage is controlled to the first sub-electrode 41, and the driving circuit outputs a second touch-control driving voltage to the second sub-electrode 42. The first touch driving voltage is different from the second touch driving voltage. Specifically, in this embodiment, the touch driving voltage is a square wave signal, and the first touch driving voltage and the second touch driving voltage can be adjusted by adjusting relevant parameters in the driving circuit 6 Or the frequency of the first touch driving voltage and the second touch driving voltage are different.

The materials of the plurality of first electrodes 40 and the second electrodes 50 can be selected from metals, indium tin oxide (ITO), zinc oxide (ZnO), poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate One of acid (Poly (3,4-ethylenedioxythiophene), PEDOT), carbon nanotube (CNT), silver nanowire (Agnano wire, ANW), and graphene (graphene), but not limited to this. Wherein, when the plurality of first electrodes 40 and the second electrode 50 are made of opaque material, the plurality of first electrodes 40 and the second electrode 50 may have a mesh structure to allow light to pass through without Influence display Function, but not limited to this, in other embodiments, the plurality of first electrodes 40 and the second electrodes 50 are designed into other patterns that allow light to pass through.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred implementations, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solution of the present invention.

1: the first substrate

40: first electrode

41: The first sub-electrode

42: second sub-electrode

6: Drive circuit

7: The first line

Claims (8)

A display device comprising: a first substrate; a plurality of first electrodes, the plurality of first electrodes are formed on the same surface of the first substrate and are arranged at intervals, and the plurality of first electrodes are used as the display device A common electrode for display; a driving circuit electrically connected to the plurality of first electrodes; the improvement lies in that: the plurality of first electrodes includes at least one first sub-electrode and a plurality of second sub-electrodes with the same area, each of the first sub-electrodes The area of the sub-electrode is smaller than the area of any one of the second sub-electrodes; the display device is a touch display device, the display device can also sense touch operations, and the first electrode is multiplexed as a touch drive electrode; The driving circuit controls the first electrode to be in the display phase and the touch phase in time sharing; in the display phase, the driving circuit outputs the first common electrode voltage to the first sub-electrode, and the driving circuit outputs the second common electrode. The electrode voltage is to the second sub-electrode; in the touch phase, the drive circuit provides a touch drive voltage for the first electrode, and the touch drive voltage includes a first touch drive voltage and a second touch drive The first touch drive voltage is different from the second touch drive voltage; the drive circuit outputs the first touch drive voltage to the first sub-electrode, and the drive circuit outputs the second touch drive Voltage is applied to the second sub-electrode. The display device according to claim 1, wherein the difference between the first common electrode voltage and the second common electrode voltage is achieved by adjusting the internal voltage of the driving circuit. The display device according to claim 1, wherein the difference between the first common electrode voltage and the second common electrode voltage is achieved by adjusting an internal current of the driving circuit. The display device according to claim 1, wherein the difference between the first common electrode voltage and the second common electrode voltage is achieved by adjusting the internal resistance of the driving circuit. The display device according to claim 1, wherein the difference between the first common electrode voltage and the second common electrode voltage is achieved by adjusting the internal capacitance of the driving circuit. The display device according to claim 1, wherein: according to the difference in area of the first sub-electrode and the second sub-electrode, a compensation voltage is applied to the first sub-electrode, and the second common electrode voltage is The standard voltage, the first common electrode voltage is the standard voltage plus the compensation voltage. The display device according to claim 1, wherein: the amplitude of the first touch driving voltage and the second touch driving voltage are different. The display device according to claim 1, wherein: the frequency of the first touch driving voltage and the second touch driving voltage are different.

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